Castlerock is a 1km (0.7 miles) long stretch of beach between the sea cliffs of Downhill to the west and the Lower River Bann estuary known as the Barmouth to the east. The beach was awarded the Seaside Award in 2020. Castlerock beach backs onto the tranquil resort of Castlerock. The dunes to the east of the entrance are home to Castlerock Golf Club. The dunes here extend back upstream of the Bann estuary to Grangemore and are some of the oldest dated dunes in Ireland.